President Donald Trump named the 'two things' he believed tanked the tenure of UK Prime Minister Keir Starmer, while also hammering him over the Iran war.

Trump responded to Starmer's teary exit on Monday during an executive order signing session in the Oval Office. 

'This is not Winston Churchill, that I can tell you,' the President said of the exiting British leader.

Starmer resigned after serving in the role for just under two years, as the Labour Party lost elections last month in Wales and Scotland, and he was weighed down by an Epstein-related scandal. 

He's the fourth British prime minister to exit in four years. 

When first asked about Starmer's resignation, Trump identified an unconventional culprit. 

Windmills. 

Trump first said Starmer was a 'lovely man' and 'sort of a friend of mine' but added that he told him, 'you're really messing up energy.' 

'You have windmills all over the place,' the President explained. 'In the meantime, you have the North Sea oil and they won't let anybody drill.'    

Trump then complained how Starmer was 'not good to us with NATO,' suggesting that it hurt the prime minister politically. 

'I mean, I wish him well, but he's got two problems - energy and immigration. And crime. But energy and immigration,' Trump said.

The President moved on to another topic, but came back to Starmer again when asked about his scheduled meeting this week with NATO Secretary General Mark Rutte.  

That prompted his 'Churchill' quip and a brief rant about how NATO members refused to help him after the US and Israel started a joint operation against Iran in late February.

'Starmer said worse than no,' Trump recalled. 'He said, we'll be there as soon as you win. I said, "We don't need you as soon as we win." 

In the same breath, Trump also slammed Italy and Germany. 

The President is currently in an online feud with Italian Prime Minister Giorgia Meloni, a fellow conservative who had previously been one of his favorite European leaders. 

Starmer and Trump have both had their time in office tainted by serial pedophile Jeffrey Epstein. 

Starmer was enveloped in a scandal over his choice for US ambassador - Lord Peter Mandelson, who was exposed in the Epstein files of passing along privileged government information to the pedophile. 

More recent electoral woes also led to Starmer's exit. 

Starmer gave a tearful address on Monday outside of 10 Downing Street, where he announced a new PM would be chosen before Parliament returns in September.

He plans to stay in his role until the new PM is chosen.

Starmer will likely be replaced by Andy Burnham, who has criticized Trump for bringing 'instability' to the United States and warned people against the 'poisonous' Trumpian style of politics.